Dimethyl sulfone (DMSO2) or methylsulfonylmethane (MSM), is an organic sulfur compound belonging to a class of chemicals known as sulfones. It occurs naturally in some primitive plants and is present in small amounts in many foods and beverages. DMSO2 reflects its close chemical relationship to dimethyl sulfoxide (DMSO), which differs only in the oxidation state of the sulfur atom. DMSO2 is the primary metabolite of DMSO in humans, and it shares some of the properties of DMSO. Dimethyl sulfone is a metabolite occurring in plasma and CSF of normal human. It derives from dietary sources, from intestinal bacterial metabolism and from human endogenous methanethiol metabolism. (PMID 15996001 ). Dimethyl sulfone can be found in Afipia (Wikipedia).

belongs to the class of organic compounds known as sulfones. Sulfones are compounds containing a sulfonyl group( which as the general structure RS(=O)2R' (R,R' =alkyl, aryl)) attached to two carbon atoms.